Unconventional superconductivity in ferromagnetic UGe2: A 73Ge nuclear magnetic resonance/nuclear quadrupole resonance study

H. Kotegawa, S. Kawasaki, A. Harada, Y. Kawasaki, K. Okamoto, G. Q. Zheng, Y. Kitaoka, E. Yamamoto, Y. Haga, Y. Onuki, K. M. Itoh, E. E. Haller

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Abstract

We report 73Ge nuclear magnetic resonance/nuclear quadrupole resonance (NMR/NQR) measurements on the itinerant ferromagnetic superconductor UGe2 at ambient pressure (P = 0) and P = 1.3 GPa. Measurements of the nuclear spin-lattice relaxation rate 1/T1 of the 73Ge NMR at P = 0 have revealed a T1T = constant behaviour well below TCurie = 52 K, evidencing the presence of a non-zero density of states at the Fermi level for the up-and down-spin bands in the ferromagnetic state. At P = 1.3 GPa, where the ferromagnetic transition is reduced to TCurie = 26 K, the dependence on temperature (T) of NQR 1/T1 at zero field has demonstrated the onset of the superconducting transition at Tc = 0.55 K. The lack of a coherence peak in (1/T1) just below Tc, followed by a T3-like behaviour, provide compelling evidence for the unconventional nature of the superconducting state that coexists with the ferromagnetic state on a microscopic scale in UGe2.

Original languageEnglish
Pages (from-to)S2043-S2046
JournalJournal of Physics Condensed Matter
Volume15
Issue number28
DOIs
Publication statusPublished - 2003 Jul 23

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ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Kotegawa, H., Kawasaki, S., Harada, A., Kawasaki, Y., Okamoto, K., Zheng, G. Q., Kitaoka, Y., Yamamoto, E., Haga, Y., Onuki, Y., Itoh, K. M., & Haller, E. E. (2003). Unconventional superconductivity in ferromagnetic UGe2: A 73Ge nuclear magnetic resonance/nuclear quadrupole resonance study. Journal of Physics Condensed Matter, 15(28), S2043-S2046. https://doi.org/10.1088/0953-8984/15/28/323